Component Server fix (#6884)

* changes

* add changeset

* Update gradio/routes.py

Co-authored-by: Aarni Koskela <akx@iki.fi>

* changes

* changes

---------

Co-authored-by: Ali Abid <ubuntu@ip-172-31-25-241.us-west-2.compute.internal>
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Aarni Koskela <akx@iki.fi>

.changeset/ten-chefs-argue.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:Component Server fix

gradio/components/file_explorer.py

@@ -139,10 +139,8 @@ def postprocess(self, value: str | list[str] | None) -> FileExplorerData | None:
         return FileExplorerData(root=root)
 
     @server
-    def ls(self, value=None) -> list[dict[str, str]] | None:
+    def ls(self, _=None) -> list[dict[str, str]] | None:
         """
-        Parameters:
-            value: file path as a list of strings for each directory level relative to the root.
         Returns:
             tuple of list of files in directory, then list of folders in directory
         """

gradio/routes.py

@@ -699,7 +699,12 @@ def component_server(body: ComponentServerBody):
                 block = state[component_id]
             else:
                 block = app.get_blocks().blocks[component_id]
-            fn = getattr(block, body.fn_name)
+            fn = getattr(block, body.fn_name, None)
+            if fn is None or not getattr(fn, "_is_server_fn", False):
+                raise HTTPException(
+                    status_code=status.HTTP_404_NOT_FOUND,
+                    detail="Function not found.",
+                )
             return fn(body.data)
 
         @app.get(

test/test_routes.py

@@ -831,3 +831,34 @@ def test_show_api_true_when_is_wasm_false(self):
         assert (
             interface.show_api is True
         ), "show_api should be True when IS_WASM is False"
+
+
+def test_component_server_endpoints(connect):
+    here = os.path.dirname(os.path.abspath(__file__))
+    with gr.Blocks() as demo:
+        file_explorer = gr.FileExplorer(root=here)
+
+    with closing(demo) as io:
+        app, _, _ = io.launch(prevent_thread_lock=True)
+        client = TestClient(app)
+        success_req = client.post(
+            "/component_server/",
+            json={
+                "session_hash": "123",
+                "component_id": file_explorer._id,
+                "fn_name": "ls",
+                "data": None,
+            },
+        )
+        assert success_req.status_code == 200
+        assert len(success_req.json()) > 0
+        fail_req = client.post(
+            "/component_server/",
+            json={
+                "session_hash": "123",
+                "component_id": file_explorer._id,
+                "fn_name": "preprocess",
+                "data": None,
+            },
+        )
+        assert fail_req.status_code == 404